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Grade 5 Titanium Countersunk Screws

High-strength Ti-6Al-4V countersunk screws for lightweight assemblies requiring a flush or near-flush head. Head angle, drive, thread, length, condition and inspection are supplied to the specified standard or drawing.

Material: Grade 5 / Ti-6Al-4V / UNS R56400
Head Styles: Flat or raised countersunk
Threads: Metric, UNC, UNF or drawing
Documents: MTC, dimensional and thread inspection

Product Detail

Product Introduction

Grade 5 titanium countersunk screws are manufactured from Ti-6Al-4V (UNS R56400) for lightweight assemblies that require high material strength, corrosion resistance and a flush or near-flush installed head. The screw definition must include the head form and angle, drive, thread, length, material condition, surface treatment, mating component and finished-fastener acceptance requirements.

Countersunk heads have lower loadability at the head-to-shank transition than full-height heads. Joint design and testing must therefore consider the complete screw geometry rather than applying bar-stock properties directly to the finished screw.

Product Specifications

Product	Grade 5 titanium countersunk screws	Material	Ti-6Al-4V / Titanium Grade 5 / UNS R56400
Head Forms	Flat countersunk or raised countersunk; drawing-specific forms available	Drive Options	Hex socket, hexalobular, cross recess, slot or drawing-specific
Dimensional References	ISO 10642, ISO 7046, legacy DIN 7991, ASME/ANSI or approved drawing, when expressly invoked	Head Angle	90° for common metric forms; 82°, 100° or other drawing-defined angles by agreement
Metric Threads	Coarse or fine pitch; ISO 10642:2026 geometry covers M2 to M20	Inch Threads	UNC, UNF or drawing-specific; available range confirmed at RFQ stage
Length & Tolerance	Measured and toleranced according to the invoked standard or approved drawing	Material Condition	Annealed or order-specific condition, subject to manufacturing and finished-screw requirements
Surface	Machined and cleaned; approved lubricant, anti-galling treatment or coating by agreement	Inspection	Head and recess geometry, length, thread gauging, surface inspection and specified mechanical tests
Documents	MTC, heat/lot traceability and dimensional inspection report	Optional Records	Mechanical test, coating or lubricant record and third-party inspection by agreement

Standard clarification: ISO 10642:2026 specifies reduced-loadability hexagon socket countersunk head screws in steel and stainless steel. For a titanium order it is used only as an agreed geometry reference. Grade 5 chemistry, material condition and finished-screw acceptance must be stated separately on the purchase order or drawing.

Send a drawing or complete screw definition
Include head angle, drive, thread, length, quantity, mating material, surface treatment and inspection requirements.

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Chemical Composition – Titanium Grade 5 / UNS R56400

Weight percent. Values are material limits; titanium is the balance.

Al	V	Fe max	O max	C max	N max	H max	Residual each / total	Ti
5.50–6.75	3.50–4.50	0.40	0.20	0.08	0.05	0.015	0.10 / 0.40	Balance

Mechanical Properties – Annealed Grade 5 Material Reference

Property	Reference Minimum	Purchasing Note
Ultimate tensile strength	895 MPa (130 ksi)	Reference minima commonly used for annealed Grade 5 bar material. Actual requirements depend on source product, diameter, condition and invoked specification.
0.2% yield strength	828 MPa (120 ksi)
Elongation	10%
Reduction of area	25%

These values describe Grade 5 source material, not an automatic finished countersunk-screw rating. Finished-screw tensile load, head strength and test method must be defined by the applicable fastener specification or approved drawing.

Typical Physical Properties

Property	Typical Value	Condition
Density	4.43 g/cm³	Room-temperature reference
Elastic modulus	Approximately 114 GPa	Room-temperature reference
Poisson ratio	Approximately 0.34	Room-temperature reference
Thermal conductivity	Approximately 6.7 W/m·K	Room-temperature reference
Coefficient of thermal expansion	Approximately 8.6 µm/m·K	Near room temperature
Melting range	Approximately 1604–1660°C	Material reference

Physical values are typical engineering references and are not inspection acceptance limits.

Certificates & Inspection Records

SAKY ALLOY quality management system certificate

Services We Can Provide

Drawing ReviewHead angle, recess, thread, length, countersink fit and tolerance review.

Custom ManufacturingMetric, inch and drawing-specific screw geometry subject to production review.

Thread InspectionGO/NO-GO gauging and dimensional reports for agreed characteristics.

Surface OptionsCleaning, identification, lubricant or anti-galling treatment by agreement.

TraceabilityMTC, heat/lot records and inspection documents matched to the order.

Export SupportProtected packing, labeling and shipping-document coordination.

Product Packaging

Countersunk screws are separated by size and lot, protected against thread, recess and surface damage, and labeled with material grade, dimensions, quantity and traceability reference. Inner bags, cartons and export cases are selected according to quantity and shipping method.

Application Scenarios

Chemical processing plant with industrial process piping

Chemical Processing Equipment

Flush fasteners for covers, guards and assemblies where the selected titanium joint is compatible with the process environment.

Wind turbines and solar panels at a renewable energy site

Power & Energy Equipment

Lightweight equipment panels and engineered assemblies requiring controlled geometry, traceability and corrosion resistance.

Marine & Shipbuilding

Flush-mounted corrosion-resistant joints for marine equipment and enclosures, subject to complete galvanic and preload review.

FAQ

Does ISO 10642 fully specify Grade 5 titanium countersunk screws?

No. ISO 10642:2026 specifies the geometry and characteristics of reduced-loadability hexagon socket countersunk head screws in steel and stainless steel. It can be used as an agreed dimensional reference, but the order must separately define Ti-6Al-4V Grade 5 material, condition, inspection and finished-screw acceptance requirements.

Which countersunk head angle should be specified?

The angle must match the prepared countersink and the invoked drawing or dimensional system. A 90-degree head is common in metric ISO and DIN geometry, while inch and aerospace drawings may use other angles such as 82 or 100 degrees. Do not substitute one angle for another without engineering approval.

How can galling be reduced during installation?

Use compatible mating materials, clean threads, an approved lubricant or coating, controlled installation speed and a validated torque or preload procedure. The selected treatment must also be compatible with the service temperature, corrosion environment and cleanliness requirements.

Grade 5 Titanium Countersunk Screws